Nude activist Trey Allen helps a blind woman through the front door at San Francisco City Hall as he protests San Francisco's new ban on nudity on February 1, 2013 in San Francisco, California. At least four nude activists were arrested as they protested San Francisco's new ban on nudity in public places. The measure proposed by Supervisor Scott Wiener is being challenged by activists who call the ordinance unfair because it grants exceptions for nudity at permitted public events. less

Nude activist Trey Allen helps a blind woman through the front door at San Francisco City Hall as he protests San Francisco's new ban on nudity on February 1, 2013 in San Francisco, California. At least four ... more

A nude activist is arrested by San Francisco police officers as he protests San Francisco's new ban on nudity at San Francisco City Hall on February 1, 2013 in San Francisco.

A nude activist is arrested by San Francisco police officers as he protests San Francisco's new ban on nudity at San Francisco City Hall on February 1, 2013 in San Francisco.

Photo: Justin Sullivan, Getty Images

A nude activist is arrested by San Francisco police officers as he... Photo-4123326.56070 - GreenwichTime

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Nude activist Trey Allen stands nude in front of San Francisco police officers as he protests San Francisco's new ban on nudity at San Francisco City Hall on February 1, 2013 in San Francisco, California.

Nude activist Trey Allen stands nude in front of San Francisco police officers as he protests San Francisco's new ban on nudity at San Francisco City Hall on February 1, 2013 in San Francisco, California.

Gypsby Taub writes a message on the back of Trey Allen before demonstrating nude in front of city hall on Friday, Feb. 1. Protesters were demonstrating the city's ban on nudity which goes into effect today.

Gypsby Taub writes a message on the back of Trey Allen before demonstrating nude in front of city hall on Friday, Feb. 1. Protesters were demonstrating the city's ban on nudity which goes into effect today.

Photo: James Tensuan, The Chronicle

Gypsby Taub writes a message on the back of Trey Allen before... Photo-4123862.56070 - GreenwichTime

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Taboola Gallery Frame Item-85307.56070 - GreenwichTime

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Nude demonstrators gather in front of city hall on Friday, Feb. 1. Protesters were demonstrating the city's ban on nudity which goes into effect today.

Nude demonstrators gather in front of city hall on Friday, Feb. 1. Protesters were demonstrating the city's ban on nudity which goes into effect today.

A nude activist wears a button on his hat as he protests San Francisco's new ban on nudity at San Francisco City Hall on February 1, 2013 in San Francisco.

A nude activist wears a button on his hat as he protests San Francisco's new ban on nudity at San Francisco City Hall on February 1, 2013 in San Francisco.

Photo: Justin Sullivan, Getty Images

A nude activist wears a button on his hat as he protests San... Photo-4123329.56070 - GreenwichTime

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Ernestine Patterson of San Francisco is helped up the steps of city hall by Trey Allen during a nude demonstration on Friday, Feb. 1.Protesters were demonstrating the city's ban on nudity which goes into effect today. less

Ernestine Patterson of San Francisco is helped up the steps of city hall by Trey Allen during a nude demonstration on Friday, Feb. 1.Protesters were demonstrating the city's ban on nudity which goes into effect ... more

Photo: James Tensuan, The Chronicle

Ernestine Patterson of San Francisco is helped up the steps of city... Photo-4123866.56070 - GreenwichTime

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Nude activist Trey Allen helps a blind woman up stairs as he protests San Francisco's new ban on nudity at San Francisco City Hall on February 1, 2013 in San Francisco, California. At least four nude activists were arrested as they protested San Francisco's new ban on nudity in public places. The measure proposed by Supervisor Scott Wiener is being challenged by activists who call the ordinance unfair because it grants exceptions for nudity at permitted public events. less

Nude activist Trey Allen helps a blind woman up stairs as he protests San Francisco's new ban on nudity at San Francisco City Hall on February 1, 2013 in San Francisco, California. At least four nude activists ... more